A Hong Kong police recruit about to enter training next week has been arrested and sacked for allegedly joining anti-government protests and possessing weapons.The 21-year-old constable was taken into custody on Thursday after officers found an extendable baton, four imitation firearms, two bottles of carbon dioxide gas and a tactical vest at his home in Kwun Tong. He was held on suspicion of possessing imitation firearms and offences against the Weapons Ordinance. No charges have been laid and…